| 摘要 |
A pin-type, double-acting synchronizer mechanism (10) with friction clutches (26, 46 and 28, 48), jaw clutches (34d, 30a and 36d, 32a) and improved self-energizing ramps (70a-70d and 72a-72d). Three circumferentially spaced pins (50) include blocker shoulders for preventing asynchronous engagement of the jaw clutches and pre-energizer surfaces which each cooperate with a pre-energizer assembly (52). The self-energizing ramps act between a shaft (12) and a shift flange (42) which is rotatable relative to the shaft and jaw clutch members (34d, 36d). Flange (42) includes radially inwardly extending teeth (72) defining the self-energizing ramps (72a, 72d) which act against the self-energizing ramps (70a, 70d) defined by a post like portion (70) formed from shaft splines (13).
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